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The answer is simile because in the sentence
(I am quite benumbed; for the notch us just like the pipe of a great pair of bellows; )
This sentence contains the wors like and if a sentence has the wors like or as is considered a simile
You should look at web sources that have recently been updated because a lot of times new information is present that could change the original point/evidence. This could discredit the source. You also should do this because the newer the information, the more credible it is in the time (older information could easily be outdated).
